Avanco Develops Type 4.5 Pressure Vessel Concept Using Thermoplastic Composite Tape Winding

Updated on July 09, 2026 • 4 min read

German composite manufacturer Avanco Composites has highlighted the advantages of its Type 4.5 pressure vessel concept, demonstrating how thermoplastic composite technology could improve the next generation of lightweight high-pressure storage systems.

In a recent technical update, the company explained that while a Type 4.5 pressure vessel closely resembles a conventional Type 4 composite pressure vessel, the two designs differ significantly in material architecture. Instead of combining a thermoplastic liner with a thermoset carbon fiber overwrap, the Type 4.5 concept employs a fully thermoplastic composite structure, allowing the liner and structural overwrap to become thermally fused.

The approach is intended to improve structural integration while supporting more efficient manufacturing and lightweight vessel design for future hydrogen and compressed gas storage applications.

Matching Polymer Systems Creates an Integrated Structure

Conventional Type 4 pressure vessels typically consist of a polymer liner—commonly made from polyamide (PA)—wrapped with carbon fiber reinforced epoxy using wet filament winding or towpreg winding.

Avanco’s Type 4.5 concept replaces the thermoset composite with a thermoplastic carbon fiber overwrap that uses the same polymer family as the liner. Because both components share compatible thermoplastic matrices, they can be fusion bonded during manufacturing rather than relying primarily on mechanical adhesion between dissimilar materials.

According to the company, this integrated structure offers several potential advantages, including improved vacuum resistance, simplified vessel preparation during storage and refilling operations, and the possibility of reducing liner thickness to further decrease overall system weight.

Laser-Assisted Tape Winding Enables Thermoplastic Processing

The company manufactures the vessels using laser-assisted thermoplastic tape winding, a process that heats incoming thermoplastic composite tape immediately before consolidation onto the rotating liner.

Unlike conventional wet winding processes, laser-assisted tape winding eliminates resin curing and enables in-situ consolidation of thermoplastic composite layers during manufacturing.

The technology is attracting increasing attention because it combines automated production with the processing advantages of thermoplastic composites, including shorter manufacturing cycles, weldability and the potential for improved recyclability compared with traditional thermoset composite structures.

Thermoplastic Pressure Vessels Gain Industry Attention

Professor’s Analysis

Composite pressure vessel technology is undergoing a gradual transition as manufacturers investigate alternatives to conventional thermoset construction.

While today’s Type 4 vessels have become widely adopted for hydrogen storage and compressed natural gas applications, thermoplastic composites offer several manufacturing advantages. Eliminating thermoset curing can shorten production cycles, while fusion bonding between compatible thermoplastic materials may improve structural integration and reduce the number of manufacturing interfaces.

Another important advantage is design flexibility. If the structural overwrap contributes more effectively to sealing performance, engineers may be able to reduce liner thickness, providing additional opportunities for lightweighting—an important objective in hydrogen-powered vehicles, aerospace systems and other weight-sensitive applications.

However, widespread adoption will depend on demonstrating long-term durability, fatigue resistance, permeation performance and compliance with pressure vessel certification standards. Manufacturing scalability and cost competitiveness will also play important roles as thermoplastic composite pressure vessels move toward commercial deployment.

Manufacturing Innovation Supports Future Hydrogen Storage

As hydrogen infrastructure continues to develop, manufacturers are exploring composite technologies that not only improve vessel performance but also increase manufacturing efficiency.

Avanco’s Type 4.5 concept illustrates how advances in thermoplastic composite processing and automated tape winding are expanding design possibilities beyond conventional filament-wound pressure vessels. Although further industrial validation will be required, integrated thermoplastic structures could represent an important direction for future lightweight pressure vessel manufacturing.

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